I did some research and found this on ClassicOldsmobile.com. Here's the direct link if you have any more questions. http://www.classicoldsmobile.com/forums/major-builds-projects/16268-72-olds-factory-tire-size-advice.html
Well the original tires were G70/14's. That equates to a 225/70/14. Jump to a 15" tire and you get a 235/60/15 or for a slightly narrower tire you can go with a 215/65/15.
yes
215/60r16 if your stock rims are 16"
Nope.
yes it can i have a 2001 alero gls and it comes with 16" stock rims and 205/55/r16 tires
8.00 x 14-inch Tires (Coupe), 8.50 x 14-inch Tires (Convertible).
You dont.
Yes you can fit 20" rims on you 1979 cutlass, if you wanted to you could fit 22" rims with low profile tires with the stock springs.
no
YES.
a 1982 cutlass and a caprice do. the Cutlass likely has 14 inch rims and the Caprice 15's but they work
You can put 22 inch rims on a 1978 Cutlass Supreme as long as the bolt pattern matches. If the bolt pattern matches, you can put any size tire on your vehicle.
Yes they will